• 복합신소재구조학회 논문집
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• 제2권3호
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• pp.12-17
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• 2011

본 논문은 노후교량바닥판 대체용으로서 하이브리드 GFRP-강재 바닥판의 휨거동을 구조적 거동특성을 기술하고 있다. 하이브리드 GFRP-강재 바닥판의 구조적 특성을 조사하기 위해 정적하중의 실험적 연구를 수행하였다. 하이브리드 바닥판의 파괴모드는 초기항복을 지나서 연성거동을 나타내었다. 결과는 유한요소프로그램 ANSYS의 값과 비교하였다. 제안된 하이브리드 바닥판이 교량적용에 유용함을 확인하였다. 하이브리드 바닥판의 두께는 유사한 휨 강성을 갖는 완전복합신소재 바닥판께와 비교하였을 때 감소될 수 있었다.

• 한국방재학회 논문집
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• 제11권2호
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• pp.15-21
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• 2011

복합재료가 건설 분야에서 보다 광범위하게 이용되기 위해서는 일반 기술자에게 이론을 쉽게 하기 위한 연구와 시험을 통한 데이터의 축적이 필요하다. 따라서 본 논문에서는 복합재료인 FRP 바닥판 부재의 따른 정적 및 피로성능을 평가하고 향후 FRP 바닥판의 해석 및 설계기준의 기초 자료를 제공하여 복합재료의 구조재 활용을 위한 기반기술을 제공하고자 하였다. 정적시험 결과 섬유방향 시험체가 섬유직각방향 시험체보다 큰 강성을 갖고 있으며 데이터 값이 훨씬 수렴되는 경향을 보이는바 이는 파괴과정에서 기지 배열에 따른 구조 특성으로 보다 안정적인 거동을 보이는 것을 알 수 있었다. 피로시험 결과 섬유방향 시험체는 섬유직각방향 시험체가 초기에 균열이 발생하는 것과 달리 시험체의 반복횟수가 증가하면서 파괴 직전에 균열을 확인할 수 있었으며, 접착면이 떨어지는 양상을 보였다.

• 한국구조물진단유지관리공학회 논문집
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• 제10권4호
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• pp.183-193
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• 2006

본 연구는 탄소섬유시트로 보강된 철근콘크리트 보에 정적하중과 반복하중이 작용할 때의 거동을 다루고 있다. 탄소섬유시트로 보강된 RC보의 정적실험 결과를 기준으로 반복하중 실험을 수행하였다. 반복하중 실험의 변수는 탄소섬유시트 겹수, 단부 U밴드 유무, 반복하중 재하속도 등이 있다. 실험결과를 통해 단조증가하중과 반복하중 하에서의 에너지 소산량과 휨 강성의 변화, 연성특성, 강도특성, 휨 거동 등을 고찰하며, 또한 탄소섬유시트의 파단변형률을 평가하였다. 본 연구에서는 반복하중 실험 결과를 바탕으로 탄소섬유시트로 보강된 RC보의 정적 및 동적 휨 보강 해석 및 설계에 필요한 기초자료를 제시하고자 한다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1991년도 춘계학술대회
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• pp.74-78
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• 1991

Conventional compression bone fracture plates sometimes cause osteoporosis under the plate due to their high rigidity which in turn transfer physiological load mostly through the plates and screws. In order to prevent the osteopenia we have designed a system which have a viscoelastic washer between plate and screw head. The washer is made of a biocompatible ploymer (untra high molecular weight polyethylene, UHMWPE). Three-dimensional finite element meshes of the human femur with the conventional and new concept bone plate ere generated and the comparative stress analyses are performed with static half-stance loading condition. The results of analyses showed that could reduce the stress shielding effect compared with the conventional plate.

• Structural Engineering and Mechanics
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• 제11권6호
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• pp.605-616
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• 2001

The purpose of this study is to investigate the effect of the shear wall location in rigid frames on the dynamic behavior of a roof structure due to vertical and horizontal earthquake motions. The study deals with a gabled long span beam supported by two story rigid frames with shear walls. The earthquake response analysis is carried out to study the responses of the roof: vibration mode, natural period, bending moment and horizontal shear force of the bearings. The study results in the following conclusions: First, a large horizontal stiffness difference between the side frames is caused by the shear wall location, which results in a large vertical vibration of the roof and a large shear force at the side bearings. Second, in this case, the seismic design method for ordinary buildings is not useful in determining the distribution of the static equivalent loads for the seismic design of this kind of long span structures.

• Structural Engineering and Mechanics
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• 제53권4호
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• pp.625-644
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• 2015

In this paper, a two-layer partial interaction composite beams model considering the higher order shear deformation of sub-elements is built. Then, the governing differential equations and boundary conditions for static analysis of linear elastic higher order composite beams are formulated by means of principle of minimum potential energy. Subsequently, analytical solutions for cantilever composite beams subjected to uniform load are presented by Laplace transform technique. As a comparison, FEM for this problem is also developed, and the results of the proposed FE program are in good agreement with the analytical ones which demonstrates the reliability of the presented exact and finite element methods. Finally, parametric studies are performed to investigate the influences of parameters including rigidity of shear connectors, ratio of shear modulus and slenderness ratio, on deflections of cantilever composite beams, internal forces and stresses. It is revealed that the interfacial slip has a major effect on the deflection, the distribution of internal forces and the stresses.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 추계학술대회 논문집
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• pp.196-201
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• 2001

Very Large Floating Structures have been planned for effective utilization of ocean space in recent years. The VLFS usually has a control tower to guide airplane securely. This paper present an effective method for calculating the wave induced hydroelastic responses of VLFS considering the effect of control tower-shapes. The source and dipole distribution method is used to calculate the hydrodynamic loads and equation of motion is derived by considering the static and dynamic coupling effects from different segments of the plate. The rigidity matrix for VLFS is formulated by finite element method using a plate theory. The calculated results for VLFS with a control tower are compared with those for VLFS without a control tower.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.404-409
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• 2005

This paper describes the result of structure analysis and load test for bogie frame. The purpose of the analysis and test is to evaluate an safety which body structure shall be considered fully sufficient rigidity so as to satisfy proper system function under maximum load. Bogie system consists of bogie frame, suspensions, wheel-sets, braking system and transmission system. Among these component, the bogie frame is most significant component subjected to the vehicle and passenger loads. The evaluation method is used the JIS E 4207 specification throughout the FEM analysis and static load test. The analysis and test results have been very safety and stable for design load conditions.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 추계학술대회 논문집
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• pp.31-35
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• 2001

Three dimensional dynamic cutting can be postulated as an equivalent orthogonal dynamic cutting through the plane containing both the cutting vector and the chip flow velocity vector in cutting process. An analytical expression of dynamic cutting force is obtained from the cutting parameters determined by the static three dimensional cutting experiments. Particular attention is paid to the energy supplied to the vibration of the tool behind the vertical vibration and the direction. The phase lag of the horizontal vibration of the tool behind the vertical vibration and the direction angel of the fluctuating cutting force must be regarded in point of stability limits. Chatter vibration can effectively be suppressed by enlarging the dynamic rigidity of the cutting system in the vertical cutting force direction. A good agreement is found between the stability limits predicted by theory and the critical width of cut determined by experiments.

• Steel and Composite Structures
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• 제19권4호
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• pp.789-809
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• 2015

This paper presents experimental and numerical studies into the structural behavior of a high performance corbel type composite connection adopted in Raffles City of Hangzhou, China. Physical tests under both monotonic and quasi-static cyclic loads were conducted to investigate the load carrying capacities and deformation characteristics of this new type of composite connection. A variety of structural responses are examined in detail, including load-deformation characteristics, the development of sectional direct and shear strains, and the history of cumulative plastic deformation and energy. A three-dimensional finite element model built up with solid elements was also proposed for the verification against test results. The studies demonstrate the high rigidity, strength and rotation capacities of the corbel type composite connections, and give detailed structural understanding for engineering design and practice. Structural engineers are encouraged to adopt the proposed corbel type composite connections in mega high-rise buildings to achieve an economical and buildable and architectural friendly engineering solution.